CN109720531B - Raft body vibration isolation device of local resonance floating raft - Google Patents
Raft body vibration isolation device of local resonance floating raft Download PDFInfo
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- CN109720531B CN109720531B CN201910078461.3A CN201910078461A CN109720531B CN 109720531 B CN109720531 B CN 109720531B CN 201910078461 A CN201910078461 A CN 201910078461A CN 109720531 B CN109720531 B CN 109720531B
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Abstract
The invention discloses a local resonance floating raft body vibration isolation device which comprises a floating raft body and a plurality of local resonance units symmetrically arranged on the floating raft body. The local resonance unit consists of a steel structure, a rubber body, an I-shaped beam and an inverted T-shaped beam; an inverted T-shaped beam with an inverted T-shaped cross section and an I-shaped beam with an I-shaped cross section are sequentially arranged on one side of the steel structure; the inverted T-shaped beam and the I-shaped beam are both integrally embedded into the rubber body; the lower end of the I-shaped beam protrudes out of the rubber body and is tightly attached to the rubber body; a gap H is formed between the inverted T-shaped beam and the I-shaped beam; the local resonance unit is fixedly connected with the raft body of the buoyant raft through an I-shaped beam. The local resonance unit part of the floating raft vibration isolation system is of a rubber structure, elastic waves in certain frequency ranges cannot be transmitted in the structure by utilizing the characteristic of the local resonance band gap, a wider vibration isolation band gap can be obtained in a low-frequency section, and the vibration isolation performance of the floating raft vibration isolation system can be effectively improved.
Description
Technical Field
The invention relates to a raft body vibration isolation device of a local resonance floating raft, in particular to a floating raft structure vibration isolation device, and belongs to the technical field of vibration isolation and noise reduction.
Background
The mechanical vibration is widely applied to machine products in the fields of national defense and military, aerospace, mechanical power, transportation and the like. The suppression of harmful vibrations has been a problem that needs to be solved urgently in engineering technology. In weaponry platforms represented by ships, low-frequency vibrations are transmitted to the casing through internal moving parts and are propagated outward in the form of noise through the casing, and stealth performance of ships is seriously impaired. At present, the vibration isolation of a floating raft is a common mode of vibration isolation of ship power equipment, the isolation of medium-frequency and high-frequency vibration is effective, and the attenuation effect of low-frequency vibration is poor. Therefore, the design and development of the vibration isolation device capable of effectively reducing the low-frequency vibration isolation effect of the ship power equipment have important significance.
In order to provide the low-frequency vibration isolation performance of the floating raft vibration isolation device, the local resonance structure is introduced into the floating raft structure, elastic waves in certain frequency ranges cannot be transmitted in the structure by utilizing the local resonance band gap characteristic, and a wider vibration isolation band gap can be obtained in a low-frequency section so as to control low-frequency vibration. Considering the requirements of preparation cost, structural strength and the like, and under the condition of not damaging the uniformity and the integrity of the structural matrix of the floating raft plate, a plurality of local resonance units are added on the uniform plate to improve the vibration isolation performance of the vibration isolation system of the floating raft.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defect of poor vibration isolation effect of the floating raft at the low-frequency section, the invention provides a raft body vibration isolation device of a local resonance floating raft, which is particularly suitable for a ship floating raft vibration isolation system. Reduce the vibration of naval vessel power equipment through buoyant raft body device and local resonance unit, make it also have better vibration isolation effect at the low frequency section. The invention is mainly suitable for vibration isolation systems of ship power equipment, such as floating rafts vibration isolation systems of ship generator sets.
The technical scheme is as follows: in order to solve the above problems, the technical scheme provided by the invention is as follows:
a raft body vibration isolation device of a local resonance floating raft comprises a floating raft body and a plurality of local resonance units symmetrically arranged on the floating raft body; the local resonance unit consists of a steel structure, a rubber body, an inverted T-shaped beam and an I-shaped beam; an inverted T-shaped beam and an I-shaped beam are sequentially arranged on one side of the steel structure; the inverted T-shaped beam is integrally embedded into the rubber body; the lower end of the I-shaped beam protrudes out of the rubber body and is tightly attached to the rubber body; a gap H is formed between the inverted T-shaped beam and the I-shaped beam; the local resonance unit is fixedly connected with the raft body of the buoyant raft through the I-shaped beam.
Further preferably, the local resonance unit is cylindrical, and the total height of the local resonance unit is 20mm to 120 mm.
Further preferably, the diameter of the local resonance unit is 1-9 times of the total height of the local resonance unit.
Further preferably, the gap H between the inverted T-shaped beam and the i-shaped beam is 1/6 to 1/3 of the total height of the local resonance unit.
More preferably, the rubber body is made of natural rubber or butadiene-acrylonitrile rubber.
Furthermore, the inverted T-shaped beam is connected with the steel structure through welding.
Further, the rubber body wraps the I-shaped beam and the inverted T-shaped beam through a vulcanization process and is connected with the steel structure to form a local resonance unit.
Further, the I-shaped beam is connected with the raft body of the buoyant raft through welding.
Furthermore, the arrangement mode of the local resonance units on the raft body of the floating raft is in a 'nine-grid' shape or a 'grid shape', or the weight-reducing holes surrounding the raft body of the floating raft are uniformly arranged in a 'square shape', and the like.
Has the advantages that: the raft body vibration isolation device of the local resonance buoyant raft provided by the invention has the following advantages:
the difficulty of vibration isolation of the current ship power equipment is low-frequency vibration isolation. Although the traditional floating raft vibration isolation device has a good vibration isolation effect in a middle and high frequency band, the vibration isolation performance in a low frequency band is poor. According to the floating raft vibration isolation device, the floating raft has a good vibration isolation effect in a low frequency band through the local resonance unit, and the vibration isolation frequency band of the floating raft vibration isolation device is greatly expanded. Secondly, the local resonance unit manufactured by the vulcanization process has a simple structure and is convenient to install.
Drawings
FIG. 1 is a schematic diagram of a local resonance unit according to an embodiment of the present invention;
fig. 2 is a front cross-sectional view of a raft body with a plurality of localized resonance units distributed therein according to an embodiment of the present invention;
fig. 3 is a left side cross-sectional view of a raft body with a plurality of localized resonance units distributed therein according to an embodiment of the present invention;
FIG. 4 is a distribution diagram of a plurality of local resonance units arranged in a square shape in an embodiment of the present invention;
FIG. 5 is a distribution diagram of several local resonance units arranged uniformly in a "nine-grid" shape in an embodiment of the present invention;
FIG. 6 is a distribution diagram of a plurality of local resonance units arranged uniformly in a grid shape according to an embodiment of the present invention;
fig. 7 is a comparison diagram of the vibration level drop of the local resonance raft body vibration isolation device adopting the arrangement mode of fig. 4 in the embodiment of the invention and the vibration level drop of the traditional raft vibration isolation device;
wherein, 1 is steel construction, 2 is the rubber body, 3 is I-shaped roof beam, 4 is the raft body of buoyant raft, 5 is the type roof beam of falling T.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a local resonance buoyant raft body vibration isolation device comprises a buoyant raft body 4 and a plurality of local resonance units symmetrically arranged on the buoyant raft body 4; the local resonance unit comprises a steel structure 1, a rubber body 2, an I-shaped beam 3 and an inverted T-shaped beam 5, wherein the inverted T-shaped beam 5 with the inverted T-shaped cross section and the I-shaped beam 3 with the I-shaped cross section are sequentially arranged on one side of the steel structure, and the inverted T-shaped beam 5 is integrally embedded into the rubber body 2; the lower end of the I-shaped beam protrudes out of the rubber body and is tightly attached to the rubber body; a gap H is formed between the inverted T-shaped beam 5 and the I-shaped beam 3; the local resonance unit is fixedly connected with the raft body 4 of the buoyant raft through the I-shaped beam 3.
The steel structure 1 and the rubber body 2 are both cylindrical, and the cross section of the steel structure 1 is rectangular; the diameter of the steel structure 1 is 180mm, and the thickness of the steel structure is 10 mm; the shape and the size of the rubber body 2 are the same as those of the steel structure 1.
The transverse plate of the inverted T-shaped beam 5 and the transverse plate at the upper end of the I-shaped beam 3 are round thin plates, the diameters of the thin plates are both 60mm, and the thicknesses of the thin plates are both 0.5 mm; the vertical plates of the inverted T-shaped beam 5 and the I-shaped beam 3 are cylindrical thin rods, the diameters of the thin rods are 1mm, and the lengths of the thin rods are 2.5 mm; the transverse plate at the lower end of the I-shaped beam 3 is a circular thin plate, the diameter of the circular thin plate is 200mm, and the thickness of the circular thin plate is 0.5 mm.
The inverted T-shaped beam 5 is welded on the steel structure 1.
The material of the rubber body 2 is selected from butadiene-acrylonitrile rubber.
The gap H is set to 5 mm.
And forming a local resonance unit by the rubber body 2, the I-shaped beam 3, the steel structure 1 and the inverted T-shaped beam 5 through a vulcanization process.
The local resonance unit is connected with the raft body 4 of the buoyant raft in a welding way through the I-shaped beam 3.
As shown in fig. 2, in the transverse direction, 10 groups of the local resonance units are uniformly distributed on each of the upper end surface and the lower end surface of the raft 4.
As shown in fig. 3, in the longitudinal direction, 11 groups of the local resonance units are uniformly distributed on the upper end surface and the lower end surface of the raft 4.
As shown in fig. 4, the arrangement of the local resonance units on the raft body 4 is such that the lightening holes surrounding the raft body are uniformly arranged in a square shape.
As shown in fig. 5, the arrangement of the local resonance units on the raft 4 is a "nine-grid-shaped" uniform arrangement.
As shown in fig. 6, the arrangement of the local resonance units on the raft 4 is uniform in a "grid-like" arrangement.
In the data comparison test of this embodiment, the arrangement of the local resonance units is as shown in fig. 4, and the units are two diesel generators, wherein the center distance between the two units is 1.95m, the total weight of the two diesel generator units and the adopted vibration isolation device is 3800kg, and the rated rotation speed of the diesel generator unit is 1500 rpm. The height of the floating raft body 4 is 0.35m, and the external dimension of the floating raft body 4 is 3.31m x 2.79m x 0.35 m.
As shown in fig. 7, it can be seen that: when the arrangement mode of the local resonance units on the raft body 4 of the floating raft is shown in fig. 4, compared with the traditional floating raft vibration isolation device, the local resonance floating raft vibration isolation device has the advantages that the drop height of the vibration level in the low-frequency band of 0-135 Hz is increased by about 20dB, and the drop height of the vibration level in the medium-high frequency band of 570-1000 Hz is increased by about 15 dB.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the principles of the invention, and these changes and modifications should be considered within the scope of the invention.
Claims (6)
1. The utility model provides a local resonance buoyant raft body vibration isolation device which characterized in that: the floating raft comprises a floating raft body (4) and a plurality of local resonance units symmetrically arranged on the upper plane and the lower plane of the floating raft body (4), wherein each local resonance unit is composed of a steel structure (1), a rubber body (2), an I-shaped beam (3) and an inverted T-shaped beam (5); an inverted T-shaped beam (5) with an inverted T-shaped cross section and an I-shaped beam (3) with an I-shaped cross section are sequentially arranged on one side of the steel structure (1), and the inverted T-shaped beam (5) is integrally embedded into the rubber body (2); the lower end of the I-shaped beam (3) protrudes out of the rubber body (2) and is tightly attached to the rubber body (2); a gap H is formed between the inverted T-shaped beam (5) and the I-shaped beam (3); the local resonance unit is fixedly connected with the raft body (4) of the floating raft through the I-shaped beam (3); the local resonance unit is cylindrical, and the total height of the local resonance unit is 20-120 mm; the diameter of the local resonance unit is 1-9 times of the total height of the local resonance unit; the gap H is 1/6-1/3 of the total height of the local resonance unit; the arrangement mode of the local resonance units on the floating raft body (4) is in a 'nine-grid' shape or a 'grid shape' or the weight-reducing holes surrounding the floating raft body (4) are uniformly arranged in a 'square shape'.
2. The isolated mounting of claim 1, wherein: a plurality of lightening holes are uniformly formed in the buoyant raft body (4).
3. The isolated mounting of claim 1, wherein: the rubber body (2) is made of natural rubber or butadiene-acrylonitrile rubber.
4. The isolated mounting of claim 1, wherein: the inverted T-shaped beam (5) is connected with the steel structure (1) in a welding manner.
5. The isolated mounting of claim 1, wherein: the rubber body (2) wraps the I-shaped beam (3) and the inverted T-shaped beam (5) through a vulcanization process and is connected with the steel structure (1) to form a local resonance unit.
6. The isolated mounting of claim 1, wherein: the connection between the I-shaped beam (3) and the raft body (4) of the floating raft is welded connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910078461.3A CN109720531B (en) | 2019-01-28 | 2019-01-28 | Raft body vibration isolation device of local resonance floating raft |
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| CN201910078461.3A CN109720531B (en) | 2019-01-28 | 2019-01-28 | Raft body vibration isolation device of local resonance floating raft |
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| CN113978678A (en) * | 2021-09-27 | 2022-01-28 | 中国舰船研究设计中心 | Floating raft vibration isolation device integrating particle damping and design method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08285009A (en) * | 1995-04-17 | 1996-11-01 | Nippon Steel Corp | Base isolation device |
| JP5103079B2 (en) * | 2007-07-19 | 2012-12-19 | 智之 堀込 | Floating energy conversion device and floating energy conversion method |
| CN101311070B (en) * | 2008-06-19 | 2011-05-04 | 江苏南极机械有限责任公司 | Modularized shock resistant vibration isolation raft for ship basic propulsion system |
| CN102717885A (en) * | 2012-06-26 | 2012-10-10 | 上海交通大学 | Horizontal floating raft vibration isolation device |
| CN103496179B (en) * | 2013-10-10 | 2015-11-18 | 航天海鹰(镇江)特种材料有限公司 | The forming method of i shaped cross section composite material structural member |
| CN204489164U (en) * | 2014-12-03 | 2015-07-22 | 武汉理工大学 | A kind of shock attenuation unit based on impact damper system |
| CN104776142B (en) * | 2015-04-09 | 2017-03-15 | 江苏高精机电装备有限公司 | Tower Buoyant Raft Shock-resistant System |
| CN106545613B (en) * | 2016-10-28 | 2018-10-23 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Glass fiber reinforced plastics composite material Buoyant Raft Shock-resistant System and its processing method |
| CN108447466A (en) * | 2018-03-28 | 2018-08-24 | 贵州大学 | A kind of locally resonant acoustic stimulation |
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